C / C++ / MFC

hanlei0000000009 wrote:

When run, if inputed string size more than eight byte, result run time error.

revanth1985 wrote:

if i know that window handle

#pragma comment(lib, "psapi")
DWORD dwPID = -1;

BOOL CALLBACK EnumChildWindowsProc(HWND hWnd, LPARAM lParam)
{
	if(hWnd == (HWND)lParam)
	{
		GetWindowThreadProcessId(hWnd,&dwPID);
	}
	return TRUE;
}


BOOL CALLBACK EnumWindowsProc(HWND hWnd, LPARAM lParam)
{
	if(hWnd == (HWND)lParam)
	{
		GetWindowThreadProcessId(hWnd,&dwPID);
	}
	else
	{
		EnumChildWindows(hWnd,EnumChildWindowsProc,lParam);
	}
	return TRUE;
}


BOOL FindWindowProcessModule(HWND Hwnd, TCHAR *szName,size_t iMaxLen)
{
	EnumWindows(EnumWindowsProc,(LPARAM)Hwnd);
	if(-1 != dwPID)
	{
		HMODULE hModule = NULL;
		DWORD dwNeeded = NULL;
		HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,FALSE,dwPID);
		if (NULL != hProcess)
		{
			if(EnumProcessModules(hProcess,&hModule,sizeof(hModule),&dwNeeded))
			{
				GetModuleFileNameEx(hProcess,hModule,szName,iMaxLen);
			}
			else
			{
				GetProcessImageFileName(hProcess,szName,iMaxLen);
			}
			CloseHandle(hProcess);
		}
	}
	return NULL != szName[0];
}

TCHAR szName[MAX_PATH] = {0};
HWND Hwnd = (HWND)::FindWindow(_T("SciCalc"),_T("Calculator"));

if(FindWindowProcessModule(Hwnd,szName,MAX_PATH))
{
	MessageBox(szName);
}
else
{
	MessageBox(_T("Calculator is not running."));
}

SRKSHOME wrote:

You can use function _getcwd(char* buffer,int maxlen) which will give you current directory.

typedef LONG NTSTATUS;
#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0 && Status < 0x3FFFFFFF)


typedef struct _IO_STATUS_BLOCK {
    union {
        NTSTATUS Status;
        PVOID Pointer;
    };
    ULONG_PTR Information;
} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;


typedef struct _UNICODE_STRING
{
	USHORT Length;
	USHORT MaximumLength;
	PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;


typedef enum _FILE_INFORMATION_CLASS
{
	FileNameInformation=9,            
} FILE_INFORMATION_CLASS, *PFILE_INFORMATION_CLASS;


typedef struct _FILE_NAME_INFORMATION
{
	ULONG FileNameLength;
	WCHAR FileName[MAX_PATH];
} FILE_NAME_INFORMATION, *PFILE_NAME_INFORMATION;


NTSTATUS (NTAPI *NtQueryInformationFile)(HANDLE,PIO_STATUS_BLOCK,PVOID,LONG,FILE_INFORMATION_CLASS);


CString GetFileNameFromHandle(HANDLE hFile)
{
	wchar_t wszFilename[MAX_PATH];
	IO_STATUS_BLOCK stb;
	FILE_NAME_INFORMATION str;
	*(FARPROC*)&NtQueryInformationFile = GetProcAddress(GetModuleHandle(_T("ntdll.dll")),"NtQueryInformationFile");
	DWORD Status=NtQueryInformationFile(hFile,&stb,&str,MAX_PATH,FileNameInformation);
	return NT_SUCCESS(Status)?CString(str.FileName, str.FileNameLength / sizeof(WCHAR)):NULL;
}

CFile f;
f.Open(_T("C:\\Test.txt"),CFile::modeRead,0);
HANDLE hFile = f.m_hFile;
MessageBox(GetFileNameFromHandle(hFile));
f.Close();

Member 4708266 wrote:

Don't want any third party Library

Member 4708266 wrote:

Don't want any third party Library